Core perforator for ink pad



y 1956 cc. JENKINS ET AL 2,746,547

CORE PERFORA'IOR FOR INK PAD 5 Sheets-Sheet 1 Filed July 31, 1955 CHARLES C. JEN/(INS 8 JOHN W. LAPO/NTE.

INVENTORS.

9 HUE8NER,8EEHLER, g WORREL x HERZ/G,

A By ATTORNB/S. a ly/4W M May 22, 1956 c. c. JENKINS ET AL 2,746,547

CORE PERFORATOR FOR INK PAD Filed July 31, 1955 5 Sheets-Sheet 2 1061 J m'{ CHARLES c. JENKINS-l JOHN m LAPOINTE', p7 f8 mmvrom.

, BNER, BEEHLER,

WORREL & HEM/0,

8 y A TTORNEVS'.

y 22, 1956 c. c. JENKINS ET AL 2,746,547

CORE PERFORATOR FOR INK PAD Filed July 51, 1953 niyu% 5 Sheets-Sheet 3 CHARLES C- JEN/(INS 5 JOHN W. LAFD/NTE,

INVENTORS.

HUE'BNER, BEEHLER, WORRE L 8 HERZ/G,

By ATTORNEYS.

May 22, 1956 c. c. JENKINS ET AL 2,7

CORE PERFORATOR FOR INK PAD Filed July 31, 1953 5 Sheets-Sheet 4 zmi 25 79 86' CHARLES CZJEN/(INS 8 JOHN W. LAPO/NTE,

INVENTORS,

HUE ENE R BEEHLE'R WORREL 8 HERZ/G,

A TTORNEYS.

May 22, 1956 c. c. JENKINS ET AL CORE PERFORATOR FOR INK PAD 5 Sheets-Sheet 5 Filed July 51, 1953 CHARLES C. JENKINS 8 JOHN W. LAPO/NTE;

IN VEN TORI.

.3 mg HRE EEN EHm mar RLM fi (A @llllli WMMHHHHU k 9 nited States Patent CORE PERFORATOR FOR INK PAD Charles C. Jenkins, La Canada, and John W. Lapointe, Van Nuys, Calif.

Application July 31, 1953, Serial No. 371,614

11 Claims. (Cl. 164-93) This invention relates to a means and method for making ink stamp pads, particularly those of a rubber or rubber-like cellular or foam material.

The invention more particularly and specifically relates to a machine for perforating and cutting frusto-conical cores in the upper surfaces and through a substantial portion of the thickness of a foam rubber stamp pad or the like.

It is among the objects of this invention to provide a new and improved apparatus for making a preferred form of foam rubber ink stamp pads.

It is also among the objects of the invention to provide such a new and improved apparatus for making such ink stamp pads in a new and improved, efiicient and eifective automatic manner.

Yet another object of the invention is the provision of a new and improved machine for the purposes indicated which will create a uniform product of high quality in a manner to avoid injury to the subject materials.

Other particular objects of the invention are to provide a new and improved machine of great efliciency, capable of facile automatic operation and incorporating new and improved hollow point coring or perforating mechanism associated with new and improved means for preventing tearing or other injury to the subject materials during the drilling or perforating operation; to insure uniform depth of perforation and shape of core; to facilitate both surface and body penetration of the subject materials for the desired coring operation; and to provide a positive disengagement of the piercing or perforating means from the subject material.

Other objects of the invention include specific improvements over general and particular methods and means heretofore intended to accomplish generally similar pur poses.

Other and more specific objects and advantages will appear and be brought out more fully in the following specification considered with reference to the accompanying drawings throughout which like parts are designated by like numerals.

In the drawings:

Figure 1 is a vertical elevational view of a preferred form of machine embodying this invention.

Figure 2 is a vertical sectional view taken as on a line 2-2 of Figure 1.

Figure 3 is a horizontal sectional View taken as on a line 3-3 of Figure 1.

Figure 4 is a partial vertical sectional view taken as on a line 4-4 of Figure 2.

Figure 5 is an enlarged detailed vertical sectional view taken as on a line 5-5 of Figure 7.

Figure 6 is a horizontal sectional view taken as on a line 6-6 of Figure 2.

Figure 7 is a fragmentary horizontal sectional view as on a line 7-7 of Figure 1.

Figure 8 is a vertical sectional view as on a line 8-8 of Figure 5.

Figures 9, 10, 11 and 12 are respectively representative Too of the platform means horizontally movable relative to the means for coring a subject pad, in progressive stages of perforation or coring thereof.

Figure 13 is a fragmentary vertical sectional view as on a line 13-13 of Figure 3.

Figure 14 is a fragmentary vertical sectional view as on a line 14-14 of Figure 2.

Figure 15 is a detailed vertical sectional view as on a line 15-15 of Figure 8, and showing a pad in a position to be perforated.

Figure 16 is a view similar to Figure 15, but showing a different and more advanced stage of perforating action.

Figure 17 is a vertical sectional view, enlarged, taken as on a line 17-17 of Figure 10, and showing a perforated pad.

Referring more particularly to the drawings, there is shown by way of illustration but not of limitation, a frame 20 adapted to be fixedly mounted upon a suitable stationary floor or foundation, not shown. A relatively movable frame portion is generally designated at 21, and a drill assembly is generally designated at 22. Both the removable frame assembly 21 and the drill assembly 22 are preferably mounted upon the stationary frame 20.

The stationary frame 20 comprises a bed plate 23 and a top plate 24. Said plates 23 and 24 are held in fixed relationship as by uprights 25. A depending frame portion includes a secondary plate 26, secured as by rods 27 to the bed plate 23.

A movable frame member 30 comprising the main supporting body for the movable frame assembly 21 is supported as on a pair of cams 31 and 32 keyed to horizontal shafts 33 whose rotation occasions reciprocating vertical movement of the movable frame assembly 21 through said movable frame member 30. Said latter frame member is guided in its vertical reciprocating movement upon vertical guide pins 34 and is normally downwardly biased as by coil springs 35. The pins 34 are, like the uprights 25, fixedly mounted in any suitable fashion on the bed plate 23.

The cross-head construction consists of a frame member 36 supported for transverse movement upon guide rods 37. Another frame member 37' is similarly mounted for slidable horizontal movement normal to the direction of the guide rods 37, as upon other guide rods 38.

Said cross-head construction is mounted on a frame member 39 secured to the movable frame member 30 and supports a cam follower 40. A vertical shaft 41 is journalled in the bed plate 23 and in the movable frame member 30, whence it extends upwardly through the crosshead, which is provided with suitable clearances as at 42 for such purpose. At its lower end the shaft 41 is splined for axial reciprocation in a driving sleeve 41 keyed or otherwise integral with the gear mechanism to be described.

A cam 43 is mounted on said vertical shaft 41 in such a manner that by its rotation a platform 44, secured thereon,

is caused to oscillate in a horizontal plane beneath and relative to the drill assembly 22.

The platform 44 preferably comprises a plate portion 45, and a bed portion 46. The latter also carries suitable guides 47, adapted and arranged on the bed for the confinement, as at four stations 48, 49, 50 and 51, or corresponding ink pad bodies 52.

Said bed 46 preferably rotates upon the plate 45, as upon suitable bearings 53, by virtue of a vertical shaft 54, to which the bed 46 is keyed for rotation.

A hub 55, likewise keyed to the shaft 54, carries suitable spaced stops such as spokes 56, secured at their ends to the body of the bed 46. The bed has an open central portion 57 to provide clearance between the spokes 56, in order that another stop member 58, mounted for vertical reciprocation as in the movable frame assembly 51, may be selectively interpositioned between the spokes 56in a manner to stop or limit the rotation of the bed 46. The operation of the bed 46 and the stop 58 will be considered again in connection with the mode of operation of the instant apparatus.

The frame, as heretofore noted, also carries on its top plate 24, the drill assembly 22. A selected number of hollow point drills are journalled in the frame of the drill assembly. Such selected drills have elongate shafts 60, journalled not merely in the top plate 24, and a second plate 61, of the assembly frame, but also in an uppermost plate 62, in a manner to function as a primary drive shaft for corresponding gangs of hollow-point drills generally designated at 64.

The elongate shafts 66 have keyways 65 by which they are non-rotatably keyed, through suitable trains to a worm gear drive 66. Said gear trains each comprises gears 67 and 63, having sleeves 69 brazed thereto and keyed t the shafts corresponding thereto. Also keyed to the shafts 69, as by brazing, are gears 70 whose teeth are intermeshed as in a linear series 71 comprising, for example, one of four rows 71, 72, 73, 74, of seven drills 75 in each row. Otherwise stated, the drill gang 64 in the illustrated embodiment comprises 28 of said drills 75 arranged in seven rows of four drills each, or four rows of seven drills each, the seven-row drills being commonly driven by corresponding integral gears.

Thus, having reference particularly to Figures 1, 2, 5, 7 and 8, row 71 is driven through gear 67 keyed to the shaft 6%. Row 72 is driven through said shaft 60, gears 68 and individual gears 79. Similarly, row 73 is geared through a corresponding shaft 60 having a corresponding gear 67 (which drives row 74) and a corresponding gear 68 driving the individual gears 70 in said row 73.

The tips 77 of the drills communicate inwardly with an axial bore 78. Said tips 77 also define a cutting edge provided by an annular chamfer 79.

The inner end 80 of the bore 78 retains a ball bearing 81. Preferably such inner end 80 is conical or otherwise tapered or rounded in a manner to center the ball bearing 81 therein, said ball being preferably of a size somewhat smaller than the diameter of the bore 78.

Said balls 81 in each drill are held in position within the drill, and the main body of the bore 38 thereunder is substantially filled by a magnetic metallic plug 82. Each such plug 82 is of cylindrical configuration, while its magnetic flux is such as to retain it within the bore of its respective drill and against the ball bearing 81 thereof. The plugs are of such a diameter that they may freely rotate upon their axes within the bores 78 of their respective drills. Their lower ends are preferably spaced slightly upwardly from the cutting ends of the drills. If desired, the plugs may be held within the corresponding shafts 68 by any desired mechanical means. Thus, the shafts may be slecvelike throughout their length, and a central rod or core fixedly retains the magnetic plugs 82 in each shaft or sleeve while said shaft or sleeve rotates therearound. Any such means for retaining the plugs relatively stationary compared to their surrounding coating sleeves may be commonly joined at their tops, or the like, to the frame for non-rotative securement.

Also secured around the drill gang 64 and about the individual 'drills thereof is a resiliently compressible, or less desirably, non-compressible, block of material 85, preferably formed with individual bores 36 adapted for the rotatable accommodation of the individual corresponding drills 75.

Said block of material 35 in its preferred form may be of neoprene foam and may have a lower surface 86 lying substantially in the plane of the drill tips '77. If used in an incompressible form, in order to permit the drills to operate in their intended manner, the lower surface 86 of the block 85 must lie in a plane somewhat above that of the drill tips 77 so as to permit said tips to project downwardly therefrom in a desired cutting action. In

4 either event, said block may be secured as by gluing to the underside of the top plate 24.

With relatively dense neoprene or other material of a suitable consistency or density, it is not always necessary to have magnetic or other inserts in the bore of the cutters. Even in the absence of inserts, and with the bore of the cutters completely hollow, suitable compression may be furnished by the block of material 85 to distort or crush or squeeze the neoprene pad being cut immediately adjacent the cutting edges of the cutters, so that conical cut are made in said pad.

The remaining features of the structure will, it is believed, .be best understood by reference to the function of the apparatus now set forth.

A block or body of neoprene foam, or the like soft, non-porous and elastic material, full of individual hollow cells, but whose walls are substantially non-porous, is placed upon the bed 46 in any of the stations 48, 49, 50 or 51, as defined by the guides 47said guides, like said block of material 85, being also preferably of soft resiliently compressible material. Preferably, one block of neoprene foam corresponding to the size and the configuration of a desired ink pad, is positioned at each of the stations 43, 49, 50, 51, making, in the illustrated embodiment, four ink pad'blocks in all.

The drills 75 are continuously rotated through the gear trains connected to the work gears 66 heretofore described. Said gears 66 are keyed to a shaft which rotated by .a motor 89, as through a belt and pulley drive 90, said pulley having a speed which, for illustrative purposes drives the drills at approximately 300 revolutions per minute.

The shafts 33 are rotated by suitable gear chains, genorally designated at 91, operated from a shaft connected to a motor (also not shown), driven at a suggested speed of 36 revolutions per minute. It is understood that these suggested speeds will vary with the nature of the material used and the proportion and arrangement of the other parts of the apparatus within the skill of those familiar with the art.

Rotation of the shafts 33 causes rotation of the cams 3i and 32, respectively keyed thereto, and such cams acting upon the movable frame member 3t) force the frame assembly 21 upwardly as to the dotted outline position shown at the top of Figure 4, wherein the bed 46 carries the ink pad bodies 52 into cutting engagement with the drills 64. The extent to which said drills enter the bodies will determine the depth of the corresponding cores 92 and the depth of the cuts 93 forming the same.

It is desirable that the drills penetrate the upper surfaces 94 of the bodies, and approach but without penetrating the lower surface 95 of the body. Thereby a maximum ink reservoir in the cuts 93, and the ink reservoir tells thus exposed to such cuts, may be obtained, without, however, causing leakage through the bottom surface 95.

As the drills engage the top surfaces 94, the block 85 and the lower ends 96 of the magnetic plugs 82 will engage said surfaces 94 and compress the bodies 52 until the drill tips perform and finish their cutting operation. Such cutting will occur during the compressed condition of the bodies 52, so that an inverted frusto-conical plug 92 is formed by the respective drills.

Compressed plugs 97 will be formed during the initial cutting operation, and these when released become the final frusto-conical plugs 92.

The upper surfaces 98 of said plugs 92 or 97 will engage the lower end 96 of the magnetic plugs 82 corresponding thereto during the initial cutting phase. Such engagement will cause the magnetic plugs to remain stationary relative to the pad bodies, and to bear against the ball bearings 81, said balls greatly facilitating said rotation.

In the absence of such rotation of the magnetic plugs, seizure between the lower ends 96 of the magnetic plugs and the upper surfaces 98 of the rubber plugs causes twisting of the rubber plugs 97 and tearing, sometimes even severing, of the plug bodies 97 from their material 52.

The blocks 85 and the magnetic plugs 82, upon continued rotation of the cams 32-32, free the ink pad bodies 52 from the gangs of drills 64, as the latter are retracted.

Simultaneously with the retraction of the drills, the cam 43 moves, through an auxiliary gear train 99, from a position shown, for example, in Figure 9, to a position shown in Figure 10. Thereby when the cams 31 and 32 again move up to force the bodies 52 against the drills, said bodies 52 will occupy a slightly different position relative to the drills, so that the holes or plugs 92 will be doubled in number and will occur, as shown at 100, adjacent their corresponding holes 92 made at the first cut, i. e., above the first holes, as shown in Figure 9.

Similarly a third movement occasioned by the cam 43 will place a third group of holes and plugs 101 adjacent and to the left of the plugs 100, as shown in Figure 11. Finally, a fourth reciprocating movement of said cam 43 will place a fourth group of holes or plugs 102 to the left of the first group of plugs 92.

By the above procedure the drills are placed apart a distance SUlfiClGnt that the cuts made at any one time will be sufiiciently far apart that the drills will not interfere with one another, or unduly stress or tear the material of the ink-pad bodies. It also permits separating of the drills a suflicient distance to permit their facile assembly without crowding of their associated gears.

As may be observedmost clearly in Figures 2 and 13, and having most particular reference to Figure 14, the shaft 33 of cam 31 carries a transverse pin 105. Said pin is adapted to engage a terminal stop collar 107, so as to draw the member 58 downwardly against the tension of its coil spring 108, thus freeing the spokes 56 and permitting rotation of the bed 46 for one-quarter of a revolution wherein the station 49 is next in position below the drills 64.

The shaft 54 of said bed 46 is normally driven as through a gear train 110, by means of an electric motor 111, or the like mechanism, so as to normally bias said shaft 54 in a clockwise direction, as seen for example in Figure 3. If an electric motor 111 is used, it should be of a type which is not adversely affected by a forced physical stoppage in the manner contemplated by the instant illustrated embodiment of this invention. The stop member 58 is restrained from rotation by suitable keys 112.

In the position of the stop collar 107 and stop member 58 and ink pads corresponding to Figures 10, 11 and 12 (these being then positioned as shown in dotted outline at 113, 114 and 115 in Figure 14) no engagement of the collar 107 by the pin 105 occurs. But after the fourth reciprocative movement of the cams 31 and 32, and upon completion of a full revolution of the cam 43, the stop 58 is tripped for indexing one of the other stations 49, 50 and 51, whereon another ink pad body 52 is located.

Although we have herein shown and described our invention in what we have conceived to be the most practical and preferred embodiment, it is recognized that departures may be made therefrom within the scope of our invention, which is not to be limited to the details disclosed herein but is to be accorded the full scope of the claims so as to embrace any and all equivalent structures and devices.

Having thus described our invention, what we claim as new and desire to secure by Letters Patent is:

1. An apparatus for cutting a plurality of closely spaced cores in an ink pad body of resilient foamed rubber-like material comprising frame means, a number of hollowpoint drill means mounted on vertical axes rotatably on the frame, support means adapted to receive and support an ink pad body confronting the hollow-point ends of the drill means, vertically reciprocal cam means supported on the frame adapted to intermittently move said support means axially relative to said drill means to drive said ends of the drill means into said pad body, horizontally rotatable cam means associated with the support means for intermittently displacing the ink pad body horizontally after each drill engagement for cutting additional cores closely adjacent cores cut therein; and powered means for rotating said drill means and for operating said cam means.

2. An apparatus as defined in claim 1, said support means comprising a table, a vertical axle mounting said table for rotation on the frame, motor means normally rotating said table on said axle, and stop means on the frame adapted to stop said table at preselected indexed positions relative to said drill means.

3. An apparatus as defined in claim 2, wherein said horizontally rotatable cam means comprises horizontally reciprocal cam and cross-head means between said frame and table means adapted to move said table means to differing horizontal positions in each of said indexed positions relative to said drill means.

4. An apparatus as defined in claim 3, release means for said stop means adapted to release said table from said stop means to permit the table means to permit the table to move to another preselected position relative to the drill means.

5. An apparatus as defined in claim 1, said drill means each defining an annular terminal cutting edge at the cutting end.

6. An apparatus as defined in claim 5, each of said hollow points defining a bore coaxial with the corresponding drill means.

7. An apparatus as defined in claim 6, said bore having an inner tapered terminal end, and a cylindrical plug rotatably disposed in and substantially filling the bore, a ball bearing centered and nested intermediate the terminal end of the bore and the inner end of the plug for reducing friction between the drill and the plug.

8. An apparatus as defined in claim 7, a magnetized cylindrical plug rotatably disposed in and substantially filling the bore, the magnetic flux of the plug being sufficient to retain the ball bearing and the plug within the bore.

9. An apparatus as defined in claim 8, the plug having a flat outer end, terminating within the bore inwardly of the cutting edge of the drill means.

10. An apparatus as defined in claim 5, a body of yieldable material closely surrounding each of the drill means for yielding action under pressure from said pad body to free the pad body from the drill means following a drilling operation.

11. An apparatus as defined in claim 10, individual drills of the drill means being spaced apart a distance greater than the distance between ultimately desired cores in the pad body, and cam means adapted to move the support means in a horizontal plane to a predetermined extent to cut added cores in relatively closer relationship to one another.

References Cited in the file of this patent UNITED STATES PATENTS 762,507 Watt June 14, 1904 1,270,038 Malm June 18, 1918 1,503,761 McBee Aug. 5, 1924 2,114,284 Barnes Apr. 19, 1938 2,374,436 Kennedy Apr. 24, 1945 2,375,518 Bolle May 8, 1945 2,433,125 Kane Dec. 23, 1947 2,463,799 Palmer Mar. 8, 1949 2,467,399 Moyer Apr. 19, 1949 

